Philosophy seems to be on a hiding to nothing. It has a 2,500-year history in the West and an extensive back-catalogue – of problems. There are questions about what exists, and what we know about it, such as: Do we have free will? Is there an external world? Does God exist? and so on. There are also questions of analysis and definition such as: What makes a sentence true? What makes an act just? What is causation? What is a person? This is a tiny sample. For almost any abstract notion, some philosopher has wondered what it really is.